How can I make a windows XP home boot disk to install said operating system on a computer?

I just set up an old desktop (with only a CD drive) and installed (and reinstalled) ubuntu, which completely glitched. Now I want to install Windows XP Home Edition (the one that's on my current computer), but I can't find my boot disk. I don't want to install Windows 7 because then I'd need to install a DVD drive. How can I make a boot CD for Windows XP, not a recovery disk.....also, I don't think my BIOS supports USB booting (i only saw floppy drive, CD drive, and hard drive) Please help me...and please note that while I know enough about computer to do the above activities, i can't program or anything like that.